Event Aggregator

最新推荐文章于 2025-02-21 04:00:00 发布

转载最新推荐文章于 2025-02-21 04:00:00 发布 · 72 阅读

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原文链接：http://www.cnblogs.com/Mr-Joe/p/3232729.html

本文介绍了一个简单的事件聚合器实现方式，包括事件的订阅与发布功能。通过JavaScript代码展示了如何创建事件及事件处理函数，并实现事件的添加、移除和触发。

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 * User: 宇乔
 * Date: 13-8-2
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function Event(name) {

    var handlers = [];

    this.getName = function () {
        return name;
    }

    this.addHandler = function (handler) {
        handlers.push(handler);
    }
    this.removeHandler = function (handler) {
        handlers.forEach(function (item, i) {
            if (item == handler) {
                handler.splice(i, 1);
            }
        })
    }

    this.fire = function (eventArgs) {
        handlers.forEach(function (h) {
            h(eventArgs);
        })
    }
}


function EventAggregator() {
    var events = [];

    function getEvent(name) {
        var fn;
        events.forEach(function (item) {
            if (item.getName() == name) {
                fn = item;
                return;
            }
        });
        return fn;
    }

    this.subscribe = function (eventName, handler) {

        var event = getEvent(eventName);

        if (!event) {
            event = new Event(eventName);
            events.push(event);
        }
        event.addHandler(handler);
    }

    this.publish = function (eventName, eventArgs) {

        var event = getEvent(eventName);
        if (!event) {
            event = new Event(eventName);
            events.push(event);
        }
        event.fire(eventArgs);
    }
}

转载于:https://www.cnblogs.com/Mr-Joe/p/3232729.html